Bulkhead-door.



No. 721,024. PATENTED FEB. 17, 1903. W. B. GOWLES.

BULKHEAD DOOR. l APPLIGATION FILED AUG. 4, 1902. 11o-nonni, 6 la sHETs-snsn'r 2,

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UNITED STATESV PATENT OFFICE.

WILLIAM BARNUM COVVLES, OF CLEVELAND, OHIO, ASSIGNOR TO LONG ARM SYSTEM COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF VEST VIRGINIA.

BuLKHEAD-Dooa. i

SPECIFICATION forming part Yof LettersPatent. No. 721,024, dated February 17, 1903. Appunto@ niet August 4, Ieoz. serial Nansen?. (no man.)

Be it known that I, WILLIAM Bannon, COWLES,-a citizen of the United States, resid-V My invention relates to improvements in.r

water-tight bulkhead-doors for use on board ship; and it consists of certain novel features I thatwillbehereinafterdescribedandclaimed.

In the manufacture of water-tight doors it has hitherto been the usual practice to make these doors f rolled iron or steel riveted to a cast frame or to a flanged frame. lVith this zo construction it is found difficult and expensive to make the joints tight, and in consequence the doors Yare expensive and not apt to t snugly. Attempts have beenmade to cast the doors in one piece; but in such cases it has been found impracticable to make a steel casting of the required thinness and the doors have been too heavy for satisfactory use on board ship, taking up too muchfof the displacement of the vessel which is desired for 3o other uses. l

only metal' which can be castin these large sheets of the required thinness, and brass is too expensive for commercial use' in this way.

According to Inyinvention I cast-the door and its frame in one piece, but with one side dat, the steel casting being about twice the desired thickness of the door. I then plane down the door on the dat side to the desired' thickness, and with a little machining on the 4o edges, and after boring the usual holes for the tighteners, dre., it is ready for use.

My invention will be understood by the accompan ying drawings,in which the same parts are indicated by the same letters throughout the several views.

Figure l represents aslidin g bulkhead-door of the type shown in the Long Arm System Companys patents, Nos. 605,399, 608,838,and 631,698. Fig. 2 is a side elevation of the same.

5o Fig. 3 is a plan view. Fig. 4 represents a sec ling in the direction of the arrows.

Some brass composition is theV tion along'the line 4 Ltof Fig. l looking upward.V Fig. 5 represents a hand-operated bulkhead-door similar to those in use in the VVnaval and merchant service, but constructed according to myinvention. Fig. 6 represents a ysection along the line 6 6 ofA Fig. 5 and look- Fig.7isa detail showing the operation of the tighteners, and Fig. 8 is a detail showing the hinge ofit'ne door and the parts contiguous thereto. Referring now to Figs. 1 to 4, A represents thedoor provided with side ribs ct and an end rib d', with bosses a2, a bottom rib of, crossrib a5, and a longitudinal rib a6 with bosses a7. In these bosses bolt-holes are bored to attach the various parts ofr the operating-gear to the door. One side of the door is cast iiat and has a thickness corresponding to that indicated by the dotted line a in Figs. 2, 3, and 4. This dat face of the door is then planed down, leaving the door the desired thickness, as indicated in Fig. 4. The flanges of the door are cast somewhat thicker than the main portion to receive the tightening-rollers referred to in the patents aforesaid.

In the form of device shown in Figs. 5 to S the door A has a heavy rim A with recesses on the back, as at a9, to receive the gasket F. Exterior to the gasket is a rib du. The door, with its rim A' and this rib ct, is cast in one piece, having 'one face dat and of a thickness corresponding to that indicated by Ythe dotted line v'ctONiIi Figlsi/ 6, 7,'and This -iiat portion is then planedawaynntil the door is of the desired thickness. When the requisite machining is done, the holes for the tighteners D are made, hinges are pnt on, and the door is otherwise made ready for use.

The tighteners D (shown in detail in Fig. 7) are journaled in bosses as in the door-casting. For water-tightness and to avoid corrosion bushings d of some brass composition are preferably provided; 'The door is provided with a rubber gasket F, held in place by tap-bolts g and by the metal strips 0312. (See Fig. 8.) This gasket dts snugly against the frame' C, which is fast to the bulkhead C.

The construction of the tighteners not being a part of my invention will not be further described.

IOS

The hinges B are secured to the door in the manner indicated in Fig. 8.

Thus it will be seen that I provide a door made of a single piece of low-cost metal, which is of the desired thickness -and which may be cheaply and quickly constructed Without the expensive drilling, fitting, riveting, and calking and which at the same time is water-tight, strong, and durable.

Having thus described my invention, what l claim, and desire to secure by Letters Patent of the United States, is-

l. As an article of manufacture, a lightweight bulkhead-door, consisting of a single piece of cast metal having one of its faces plane and the other face provided with strengthening and retaining ribs, said door being made by casting a blank of abouttwice the required thickness and planing 0E one WILLIAM BARNUM COWLES.

Witnesses:

CHAS. J. METZ, HOMER E. DANIELS. 

